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I killed one 20 box with 183rwkw behind the RB20, beat up on it pretty hard though and I think it was rather tired to begin with.

Replaced it with another 20 box and it was fine till I put the RB30 in.. then it didn't even last 2 months with the 3L torque.

All other drivetrain components are fine but I put Nismo 2way in about 8 months ago because the stocker diff was single pegging it.

Tailshaft is also a custom unit to handle uber torque and was built when the 25box went in.

So would you say the best thing for me to do is ... wait n see if i blow my 20 box then get it replace with a 25 box?

is the 25 box much stronger or is there another solution for a similar cost price>?

well how much power are you pulling atm and how much do you plan to be pulling?

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